ENMET PROAIR 2200 User Manual

Page 30

2200

ENMET Corporation

5.4.4

B High Cal/SpanGas Adjust

A High Cal/Span Gas should only be preformed after a successful Low Cal/ZeroCal has been completed.

Press the

SELECT

switch, that moves the cursor one digit to the right when the last digit is accepted the display will move

to "

HiCal xx

" gas calibration.

= the level of gas to be used for calibration. The mV reading is shown in the upper right

hand corner of the display.

Apply calibration gas to sensor. See

Figure 7. After about 1 minute and mV reading has stabilized.

Press the

SELECT

switch, that moves the cursor one digit to the right, when the last digit is accepted and the calibration is

successful the display will momentarily show Cal OK then slope and off set readings, before returning to the Calibration
Menu

Repeat above steps for each channel to be calibrated.
An unsuccessful calibration will result in an error message being displayed,

Example:

Offset Err, Cal Slope Err

If any

Err messages appear the channel needs to be re-calibrated.

To continue on too next section Press the

OPTION

switch.

Press

OPTION

switch until “Exit maint menu” appears and then press

SELECT

switch to return the instrument to the

Operational Display

When calibration is completed exit the calibration menu and maintenance menu. At the Operational Display if no error
messages are present then calibration is complete.

5.5 Dew Point Sensor

Unlike the CO and O

sensors, the dew point sensor cannot be field calibrated. To assure correct performance, the dew point

sensor should be replaced every two years.

5.6 Flow Control Orifice / Pre-filter

A 0.005-inch diameter orifice is used to set the flow rate and to drop the air pressure. A pre-filter is in line to help prevent
clogging. In well-maintained medical air systems, this orifice should not clog. However, if difficulty is experienced in
maintaining flow rate with assured inlet pressure, remove air pressure from the equipment and examine this orifice and pre-
filter; replace it if necessary.

Orifice location will depend on instrument sensor configuration. Orifice and pre-filter are located at the output point of the dew
point probe manifold or on the inlet line to the gas sensor manifold.